As of firefox v 50.0, firebug is no more functional (http://stackoverflow.com/questions/40744448/why-got-firebug-removed-after-updating-firefox-to-version-50). Firebug was one of the joys of web development using firefox now I am horrified by the idea of using default DevTools. Are there any options besides firebug and DevTools now ?
I made the transition from firebug to chrome devtools about 6 years ago. It took 2 weeks to fully feel comfortable with the UI differences but I'm glad that I did.<p>Google was asking their internal teams (gmail, etc) to eat their own dogfood. If it was good enough for complex apps like that, it was certainly good enough for the marketing style sites I was pushing out at the time.